/*
 * graph2D
 * Copyright (c) 2009 Shun Moriya <shun@mnu.sakura.ne.jp>
 *
 * The MIT License
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#if !defined(___GRAPH2D_STOPWATCH_H___)
#define ___GRAPH2D_STOPWATCH_H___

#if defined(TARGET_WINDOWS)
#include <windows.h>
#elif defined(TARGET_IPHONE)
#include "platform/iOS/stopwatch_impl.h"
#else
#include <sys/time.h>
#endif

namespace Graph2D
{
	//! @brief ストップウォッチクラス
	class Stopwatch
	{
	public:
		//! @brief コンストラクタ
		Stopwatch()
		{
			start();
		}

		//! @brief 計測開始
		void start()
		{
			startTime = now();
		}

		/*!
		 * @brief	計測終了
		 * @return	区間時間(単位は秒)
		 */
		float stop() const
		{
			return static_cast<float>(now() - startTime);
		}

		/*!
		 * @brief	現在時間を取得
		 * @return	時間(単位は秒)
		 */
		static double now()
		{
#if defined(TARGET_WINDOWS)
			LARGE_INTEGER frequency, counter;
			if(!QueryPerformanceFrequency(&frequency) || !QueryPerformanceCounter(&counter))
				return 0.0;
			return static_cast<double>(counter.QuadPart) / static_cast<double>(frequency.QuadPart);
#elif defined(TARGET_IPHONE)
			return Implementation::Stopwatch::now();
#else
			struct timeval current;
			return (gettimeofday(&current, NULL) == 0) ? static_cast<double>(current.tv_sec) * 1e-6 : 0;
#endif
		}

	private:
		double startTime;		//!< 時間(単位は秒)
	};
}

#endif
